Allow / DIsallow Abutment option in a pcell - Example wanted!

Hi,

Is it possible to from the schematic disallow the abutment of a pcell.
In other words when invoking the pcell properties have a toggle button
which disallows the abuting of the pcell so it must remain a single
entity. If so can you provide some example code to demonstrate this?

 

The problem is that you may well want the pins to be there for routing
purposes...

Another approach is to leave the pins there, but have a pcell parameter that
stops it adding the abutment properties (e.g. abutFunction, abutAccessDir etc)
on the pins.

Or you could make your abut function check for a particular property on the
instance and allow/disallow the abutment. I'd probably use the pcell parameter
controlling whether the abut properties are added, if it was me.

Regards,

Andrew.

 

But if you abut two transistors with shared source/drain, with no connection to
anything else, you'd often want to remove the metal - so the usual approach is
to keep the diffusion pins, and have the abutment properties (or not!) on those
pins.

Andrew.